a = [1, 2, 3, 4, 5]
b = [11, 22, 33, 44, 55, 66]
c = [111, 222, 333, 444]

result = []
for i, xb in enumerate(b):
    try:
        xa = a[i]
    except IndexError:
        xa = None

    try:
        xc = c[i]
    except IndexError:
        xc = None

    group = [xa, xb, xc]
    result.append(group)
print('result:', result)
